Coal-burning furnace



(NO Mdel.)

A. G. MOORE xv J. W. BAHN.

GOAL BURNING FURNAGE. No. 279,969. Patented June Z6, 1883.

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N. PETERS. Pbommlwgupher, washmgim n. C.

UNITED STATE-sj PATENT OFFICE.

ARTHUR e. MOORE, or wINToN PLI/ion, AND JOHN w. BAHN, on OINOIN- NATI,OHIO.`

COAL-BURNING FURNAOE.

SPECIFICATION forming part of Letters Patent No. 279,969, dated June 26, 1883.

' Application mea January 11,1382. (No model.)

To all whom it may concern.-

Be it known that we, ARTHUR G. MOORE, of Vinton Place, Hamilton county,Ohio, and JOHN Y XV. BAHN, of Cincinnati, Hamilton county, Ohio, haveinvented certain new and useful Improvements in Coal-Burning Furnaces,of which the following is a specification.

Our invention has for its object the economizing of fuel and preventingthe production IO of an undue amount of smoke.

Our invention is applicable to all classes of furnaces, whetherfoirheating purposes or for generating steam; but for purposes ofillustration we have shown it as employed in an ordi- I 5 naryheating-furnace.

Referring to the drawings forming part of this specification, Figure lis a perspective view ofthe furnace, part of the outer wall bcing brokenout to show the parts within. Fig.

2O 2 is a vertical transverse section through the fire-chamber, lookingtoward the rear of the furnace. Fig. 3 represents a horizontal sectionof the furnace, the section being taken a short distance above thegrate-bars.

A represents the outer wall of the furnace, which is made of any desiredshape. This furnace is provided with the usual fuel-doors, a., andash-pit doors a. The fire-chamber H is p rovided with the grate-bars D,made of any desired form and supported in the usual I nanner.

At the rear of the fire-chamber is located the bridge or division wallC, extending from bottom to top or roof of the furnace, and completelyseparating the fire-chamber and ash- 3 5 pit K from the openings orcombustion-chamber M, as the case may be, in the rear, except ing forand at the throat or openin g A, through the upper portion of whichlatter the products of combustion pass. The sides of this throat 4o areformed by the portions c e ofthe bridge-wall.

A wall or equivalent obstruction, E, is placed against the rear faceofthe bridge-wall, extending up to the level of the upper surface of thegrate-bars, closing the opening through the bridge-wall below thegrate-bars, forming a chamber, G, at the rear of the ash-pit and imme- Adiately below the throat A. This chamber G is for the purpose ofadmitting air to the grate B, and need not necessarily be of the preciseform 5o shown, but may, if desired, be in the form of a closed chamberand receive its air-supply from a source other than through the,ash-pit. The grate-bars are extended back into the openings in thebridge-wall toward the Iear face of the bridge-wall; or separate bars Bmay be placed in the opening instead of extending the main grate-bars.

Instead of the wall E, as shown in the drawings, the furnace in the rearof the bridge-wall may be filled to a level with the grate-bars; 6o butthe small wall E serves the same purpose and is less expensive.

XVe do not conne ourselves to the particular shape of the throat A shownin the drawings, as it may be made of any desired shape withoutmaterially interfering with the Operation of our invention. It has beenfound that a narrow and high throat operates Inore effectively than awide throat, and we preferably employ the narrow form.

The manner in which our invention, as above described, operates is asfollows: Then the fire has been started in the fire-chamber, a draft iscreated and the smoke passes through the contracted throat A. Air entersthe ash-pit 7 5 through the openin gs p rovi ded and passes back to thebridge-wall, where it enters the chainber G, and passes up through thegrate B, supplyingthe requisite oxygen to the incandescent fuel restingupon it. As the products of coin- SO bustion from the fire-chamber enterthe contracted throat A, the heat is concentrated at this point and acomplete combustion takes place as aconsequence.

By the employment of our invention as ab ove 8 5 described theproduction of an undue amount of smoke is cffectually prevented and agreat saving of fuel is effected.

Ve do not oonne ourselves to the employment of one throat A and chamberG at the 9o rear of the fire-chamber, as it will be obvious that morethan one may be employed. So, also, the grate B may be in the form of aplate having perforations to allow the passage of air from below, or ofany other desired equivalent g 5 construction.

Having thus described our invention and its Inode of operation, what weclaim as new and of our invention, and desire to secure by LettersPatent, is as follows:

IOO

ber in rear of the bridge-Wall, a laterally-C011- traeted opening (oneor more) in the bridge- Wztll rising from the grate, the extension ofthe grate to form the bottom of said opening, and 15 the :tir-duet belowthe extension of the grate.

ARTHUR G. MOORE. JOHN V. BAHN.

Attest:

JOHN J. MoLLoY, E. R. HILL.

